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| 1 | Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics显示文摘In order to enhance dielectric properties of polymer-derived SiC ceramics,a novel single-source-precursor was synthesized by the reaction of an allylhydrido polycarbosilane(AHPCS)and divinyl benzene(DVB)to form carbon-rich SiC.As expected,the free carbon contents of resultant SiC ceramics annealed at 1600℃are significantly enhanced from 6.62 wt%to 44.67 wt%.After annealing at 900-1600℃,the obtained carbon-rich SiC ceramics undergo phase separation from amorphous to crystalline feature where superfine SiC nanocrystals and turbostratic carbon networks are dispersed in an amorphous SiC(O)matrix.The dielectric properties and electromagnetic(EM)absorption performance of as-synthesized carbon-rich SiC ceramics are significantly improved by increasing the structural order and content of free carbon.For the 1600℃ ceramics mixed with paraffin wax,the minimum reflection coefficient(RCmin)reaches-56.8 dB at 15.2 GHz with the thickness of 1.51 mm and a relatively broad effective bandwidth(the bandwidth of RC values lower than-10 dB)of 4.43 GHz,indicating the excellent EM absorption performance.The carbon-rich SiC ceramics have to be considered as harsh environmental EM absorbers with excellent chemical stability,high temperature,and oxidation and corrosion resistance. | Zhaoju YU Xuan LV Kangwei MAO Yujing YANG Anhua LIU | 2020 | Journal of Advanced Ceramics2020，9，5： | 5 |
| 2 | 3D printing of high-performance micro-supercapacitors with patterned exfoliated graphene/carbon nanotube/silver nanowire electrodes显示文摘Micro-supercapacitors(MSCs)show great potential as on-chip energy storage devices for portable electronics.The major flaw of thin-film MSCs is their low energy density.To improve the energy density,thicker electrodes are required.However,the fabrication of MSCs with thick electrodes remains a challenge.In this work,a novel 3D printing method is employed to fabricate high-performance MSCs with interdigitated exfoliated graphene(EG)/carbon nanotube(CNT)/silver nanowire(Ag NW)electrodes.The nanowelding of Ag NW junction plays a critical role in the realization of 3D printing.To enhance the electrochemical performances of EG,phosphorus atoms are incorporated into the carbon framework with 1.7 at%.The areal capacitance of the 3D printed MSC is 21.6 mF cm^(-2)at a scan rate of 0.01 V s^(-1).The areal energy density of the MSC ranges from 0.5 to 2μWh cm^(-2)with a maximum power density of 2.5 mW cm^(-2). | LIU Lang LU JunYong LONG XinLin ZHOU Ren LIU YingQuan WU YiTing YAN KangWei | 2021 | Science China(Technological Sciences)2021，64，5： | 4 |
| 3 | Transcriptomic Analysis of Differentially Expressed Genes and Alternative Splicing Events Associated with Crassulacean Acid Metabolism in Orchids显示文摘Phalaenopsis equestris is an obligate crassulacean acid metabolism(CAM) plant with high ornamental and economic value. CAM photosynthesis is associated with drought tolerance and efficient water utilization, which enhances the survival rate of CAM plants in arid environments.The identification and analysis of CAM-related genes will be helpful to improve our understanding of the regulatory mechanisms of CAM metabolism. In this study, we analyzed RNA-Seq data to identify differentially expressed genes(DEGs) between circadian day and night in P.equestris leaves then performed GO and KEGG functional enrichment analysis. The pathways that were significantly enriched among these DEGs included carbon fixation, circadian clock regulation, glucose metabolism, photosynthesis, and plant hormone signaling. We also used Pac Bio long-read Iso-Seq technology, which identified many alternative splicing events for key genes in CAM-related pathways, including carbon fixation, circadian clock regulation, and stomatal movement. These findings suggested that alternative splicing events might be involved in CAM metabolism. Many unknown or uncharacterized genes were also found to be potentially involved in CAM metabolism. For example, the Peq000162 gene encodes a protein belonging to the Ldp A(light-dependent period) iron-sulfur protein family, and it was found to generate many alternatively spliced products. These findings shed light on CAM metabolic mechanisms in P. equestris along with the molecular functions of key CAM genes. Ultimately, the information may help enhance crop yield and drought tolerance through the introduction of CAM features into C3 crops. | Ying Zhang Wei Dong Xinghua Zhao Aixia Song Kangwei Guo Zhongjian Liu Liangsheng Zhang | 2019 | Horticultural Plant Journal2019，5，6： | 2 |
| 4 | Organic salt-assisted liquid-phase shear exfoliation of expanded graphite into graphene nanosheets显示文摘How to improve the efficiency of liquid-phase shear exfoliation(LPSE)for mass production of large-size graphene nanosheets still remains an ongoing challenge.In this work,we have developed a LPSE method using a rotor-stator mixer.It is quite simple and efficient by exfoliation of expanded graphite(EG)in Nmethyl-2-pyrrolidone(NMP)with the assistance of organic salts including sodium citrate,potassium citrate and sodium tartrate.The LPSE of EG in NMP can provide improved yields,up to 6 times as high as values from exfoliation of natural flake graphite(NFG).The additive of organic salts in NMP can make a further improvement in graphene yields,1.5 times higher than that obtained only in NMP.Remarkably,the yields of the as-exfoliated graphene are as high as 10%under optimal conditions,and up to 50%after multiple-cycle exfoliation.Organic salts in LPSE act as analogue grinding aids enhancing the applied shear forces and thus contributing to the improved efficiency of LPSE,but they do not intercalate into the interplanar spaces of graphite.This facile LPSE method should have excellent potential in the large scale production of graphene nanosheets for numerous applications. | Bin Liang Kangwei Liu Peng Liu Long Qian Guangyao Zhao Weisheng Pan Chaojie Chen | 2021 | Journal of Materiomics2021，7，6： | 1 |
| 5 | Ultra-sensitive hybrid diamond nanothermometer显示文摘Nitrogen-vacancy(NV)centers in diamond are promising quantum sensors because of their long spin coherence time under ambient conditions.However,their spin resonances are relatively insensitive to non-magnetic parameters such as temperature.A magnetic-nanoparticle-nanodiamond hybrid thermometer,where the temperature change is converted to the magnetic field variation near the Curie temperature,were demonstrated to have enhanced temperature sensitivity(11 m K Hz-1/2)(Wang N,Liu G-Q and Leong W-H et al.Phys Rev X 2018;8:011042),but the sensitivity was limited by the large spectral broadening of ensemble spins in nanodiamonds.To overcome this limitation,here we show an improved design of a hybrid nanothermometer using a single NV center in a diamond nanopillar coupled with a single magnetic nanoparticle of copper-nickel alloy,and demonstrate a temperature sensitivity of 76μK Hz-1/2.This hybrid design enables detection of 2 m K temperature changes with temporal resolution of 5 ms.The ultra-sensitive nanothermometer offers a new tool to investigate thermal processes in nanoscale systems. | Chu-Feng Liu Weng-Hang Leong Kangwei Xia Xi Feng Amit Finkler Andrej Denisenko Jorg Wrachtrup Quan Li Ren-Bao Liu | 2021 | National Science Review2021，8，5： | 1 |
| 6 | Progress in rectifying-based RRAM passive crossbar array显示文摘Resistive random access memory(RRAM) with crossbar structure is receiving widespread attentions due to its simple structure,high density,and feasibility of three-dimensional(3D) stack.It is an extremely promising solution for high density storage.However,a major issue of crosstalk restricts its development and application.In this paper,we will first introduce the integration methods of RRAM device and the existing crosstalk phenomenon in passive crossbar array,and then focus on the 1D1R(one diode and one resistor) structure and self-rectifying 1R(one resistor) structure which can restrain crosstalk and avoid misreading for the passive crossbar array.The test methods of crossbar array are also presented to evaluate the performances of passive crossbar array to achieve its commercial application in comparison with the active array consisting of one transistor and one RRAM cell(1T1R) structure.Finally,the future research direction of rectifying-based RRAM passive crossbar array is discussed. | ZHANG KangWei LONG ShiBing LIU Qi LUE HangBing LI YingTao WANG Yan LIAN WenTai WANG Ming ZHANG Sen LIU Ming | 2011 | Science China(Technological Sciences)2011，54，4： | 1 |
| 7 | Influence of Change of Decay Heat Exchanger Inlet/Outlet Window Opening Row Number on Flow Characteristic显示文摘The flow resistance of the inlet/outlet windows of the decay heat exchanger is related to the opening hole row number on the window.In the case that the size and the number of opening holes are constant,the more hole rows are opened on the window,the smaller the flow resistance of the fluid flows through the inlet | LIU Mengmeng SONG Guangdong PENG Kangwei | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
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